3A Single Cell Li-on Battery Slave Switching Charger

RT9465

The RT9465 is a switch-mode single cell li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller and high accuracy voltage regulation. Besides, the charging current is regulated through the integrated sensing MOSFET. The RT9465 optimizes the charging task by using a control algorithm to vary the charge rate via different modes, including fast charge mode and constant voltage mode. The key charge parameters are programmable via the I²C interface. The junction temperature is monitored by ADC.

Other features include under-voltage protection, over- voltage protection (including V_BAT and V_IN side), thermal regulation and MIVR.

The RT9465 is available in a WQFN-16L 3x3 package.

Applications

Cellular Telephones
Personal Information Appliances
Tablet PC, Power Bank
Portable Instruments

Key Spec.

	RT9465
Status	Active
Vin (min) (V)	3.9
Vin (max) (V)	14
Battery Charge Voltage (max) (V)	5.06
Battery Charge Current (max) (A)	3
Status Indicator	No
Charger Type	Switching
Input Source	USB
Features	Adjustable Current Limit;Current Mode Control;Cycle-by-Cycle Current Limit;I2C;OCP;OVP;UVP
Package Type	WQFN3x3-16
Built-in Power MOSFETs	Yes

Features

Input Voltage Range : 3.9V to 14V
Synchronous 1.5MHz/0.75MHz Switching Frequency 95% Max. Duty
Up to 92%/94% Peak Efficiency at V_IN = 9V/5V
V_IN Over-Voltage Protection : 14.5V
V_IN Under-Voltage Protection : 3.8V
V_IN Under-Voltage-Lock-Out : 3.3V
Fault Detection (V_IN and V_BAT Monitoring)
Programmable Minimum Input Voltage Range : 3.9V to 13.4V (0.1V/Step)
Programmable Battery Voltage Regulation Range : 3.8V to 5.06V (0.02V/Step)
Programmable End of Charge Range : 0.6A to 1.6A (0.1A/Step)
Programmable Average Output Current Regulation Range : 0.6A to 3A (0.1A/Step)
Junction Temperature Monitor : 60°C to 116°C (4°C/Step)
V_IN Minimum Input Voltage Regulation (MIVR) : ±3%
Battery CV (Constant Voltage) Regulation : ±1%
Output CC (Constant Current) Regulation, Output Current < 1A : ±100mA (V_IN = 9V/12V)
Output CC (Constant Current) Regulation, Output Current > 1A : ±10% (V_IN = 9V/12V)
Junction Temperature Monitor Accuracy : ±3°C
Thermal Shutdown : 160°C